怎么样在javascript中实现动态统计统计开发？

<div id="content">
  <div class="legend">
  <h1>汽车销量:</h1>
  <div class="skills">
  <ul>
  <li class="jq">大众</li>
  <li class="css">丰田</li>
  <li class="html">别克</li>
  <li class="php">福特</li>
  <li class="sql">长安</li>
  </ul>
  </div>
  </div>
  <div id="diagram"></div>
  </div>
  <div class="get">
  <div class="arc">
  <span class="text">大众</span>
  <input type="hidden" class="percent" value="95" />
  <input type="hidden" class="color" value="#97BE0D" />
  </div>
  <div class="arc">
  <span class="text">丰田</span>
  <input type="hidden" class="percent" value="90" />
  <input type="hidden" class="color" value="#D84F5F" />
  </div>
  <div class="arc">
  <span class="text">别克</span>
  <input type="hidden" class="percent" value="80" />
  <input type="hidden" class="color" value="#88B8E6" />
  </div>
  <div class="arc">
  <span class="text">福特</span>
  <input type="hidden" class="percent" value="53" />
  <input type="hidden" class="color" value="#BEDBE9" />
  </div>
  <div class="arc">
  <span class="text">长安</span>
  <input type="hidden" class="percent" value="45" />
  <input type="hidden" class="color" value="#EDEBEE" />
  </div>
  </div>

#content {
position:absolute;
top:50%;
left:50%;
margin:-340px 0 0 -450px;
width:900px;
height:600px;
}
.legend {
float:left;
width:250px;
margin-top:140px;
}
#content h1 {
font-family:'Cabin Sketch', arial, serif;
text-shadow:3px 3px 0 #ddd;
color:#193340;
font-size:40px;
margin-bottom:40px;
text-align:right;
}
.skills {
float:left;
clear:both;
width:100%;
}
.skills ul,
.skills li {
display:block;
list-style:none;
margin:0;
padding:0;
}
.skills li {
float:right;
clear:both;
padding:0 15px;
height:35px;
line-height:35px;
color:#fff;
margin-bottom:1px;
font-size:18px;
}

var o = {
   init: function () {
    this.diagram();
   },
   random: function (l, u) {
    return Math.floor((Math.random() * (u - l + 1)) + l);
   },
   diagram: function () {
    var r = Raphael('diagram', 600, 600),
     rad = 73;
    r.circle(300, 300, 85).attr({ stroke: 'none', fill: '#193340' });
    var title = r.text(300, 300, 'loading...').attr({
     font: '20px Arial',
     fill: '#fff'
    }).toFront();
    r.customAttributes.arc = function (value, color, rad) {
     var v = 3.6 * value,
      alpha = v == 360 ? 359.99 : v,
      random = o.random(91, 240),
      a = (random - alpha) * Math.PI / 180,
      b = random * Math.PI / 180,
      sx = 300 + rad * Math.cos(b),
      sy = 300 - rad * Math.sin(b),
      x = 300 + rad * Math.cos(a),
      y = 300 - rad * Math.sin(a),
      path = [['M', sx, sy], ['A', rad, rad, 0, +(alpha > 180), 1, x, y]];
     return { path: path, stroke: color }
    }
    $('.get').find('.arc').each(function (i) {
     var t = $(this),
      color = t.find('.color').val(),
      value = t.find('.percent').val(),
      text = t.find('.text').text();
     rad += 30;
     var z = r.path().attr({ arc: [value, color, rad], 'stroke-width': 26 });
     z.mouseover(function () {
      this.animate({ 'stroke-width': 50, opacity: .75 }, 1000, 'elastic');
      if (Raphael.type != 'VML') //solves IE problem
  this.toFront();
      title.animate({ opacity: 0 }, 500, '>', function () {
       this.attr({ text: text + '\n' + value + '%' }).animate({ opacity: 1 }, 500, '<');
      });
     }).mouseout(function () {
      this.animate({ 'stroke-width': 26, opacity: 1 }, 1000, 'elastic');
     });
    });
   }
  }
  $(function () { o.init(); });